Outdoor Power Circuit Board; Brief Check Of Power Module - Mitsubishi Electric PUMY-P250YBM Technical & Service Manual

Outdoor power circuit board

TBU, TBV, TBW
Connect to the compressor (MC)
Voltage among phases:
–
10 400 VAC
TBP2
Connect to
the DCL
TAB connec-
tor on X52CA
Connect to the
RS resistor
TBP1
Connect to the
DCL
OCH760

Brief Check of POWER MODULE

If they are short-circuited, it means that they are broken.
Measure the resistance in the following points (connectors, etc.).
1. Check of Diode module (DS10)
L1 - P1 , L2 - P1 , L3 - P1 , L1 - N1 , L2 - N1 , L3 - N1
2. Check of IPM (IC700)
P2 - U , P2 - V , P2 - W , N2 - U , N2 - V , N2 - W
Note: The marks L1 , L2 , L3 , N1 , N2 , P1 , P2 , U , V and W
shown in the diagram are not actually printed on the board.
P2
U
V
W
N2
N1
L3
L2
P1
L1
CN2
Connect to the outdoor controller circuit board (CN2)
1–5: Power circuit board
signal to the controller board (0–5 VDC)
2–5: Zero cross signal (0–5 VDC)
3–4: Not used
6–5: 15 VDC
7–5: 15 VDC
[ 5 : −
103
IPM (IC700)
Diode module
(DS10)
TBL3
TBL2
TBL1
Connect to the
outdoor noise
filter circuit board
(LO1, LO2, LO3)
400 VAC
CN6
Thermistor
<Heat Sink> (TH8)
CN5
Detection of primary
current (Connect to
the outdoor noise filter
circuit board (CNCT))
CN4
Connect to the
outdoor controller
circuit board (CN4)
Transmitting
→
1, 2, 6, 7 : + ]